· In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.4/6; CBS's "Late Show with David Letterman," 2.1/6 with an encore; and ABC's combo of "Nightline," 2.6/6; and "Jimmy Kimmel Live," 1.3/4.

· In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.8/4; "Late Show," 0.4/2 with an encore; "Nightline," 0.9/4; and "Jimmy Kimmel Live," 0.5/3.

· At 12:35 a.m., "Late Night with Jimmy Fallon" (1.3/5 in metered-market households) beat CBS's "Late Late Show with Craig Ferguson" (1.0/4). In the 25 markets with Local People Meters, "Late Night" (0.5/3 in 18-49) topped "Late Late Show" (0.2/2).

· At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.8/4 in metered-market households with an encore and a 0.3/2 in adults 18-49 in the 25 markets with local people meters.

Here are the highlights of the 13 ad-sustained programs that aired in primetime on the broadcast networks one year ago (9/13/11):

NBC (8.23 million viewers, #2; adults 18-49: 2.4, #1) took home top honors on Tuesday thanks to the penultimate episode of "America's Got Talent" (13.20 million viewers, #1; adults 18-49: 3.6, #1). Said broadcast was bookended by the season finale of "It's Worth What?" (4.70 million viewers, #8; adults 18-49: 1.1, #9) and the season premiere of "Parenthood" (6.78 million viewers, #6; adults 18-49: 2.3, #2). "Parenthood" possted its largest overall audience in the past year, since its year-ago season premiere on 9/14/10.

ABC (7.65 million viewers, #3; adults 18-49: 1.7, #2) then claimed the silver with a new "Wipeout" (6.09 million viewers, #7; adults 18-49: 2.0, #3) and the two-hour special "Jacqueline Kennedy: In Her Own Words" (8.43 million viewers, #4; adults 18-49: 1.5, #7).

Meanwhile, The CW (2.32 million viewers, #4; adults 18-49: 1.0, #4) offered up the return of "90210" (1.63 million viewers, #13; adults 18-49: 0.8, #T11) and the premiere of
"Ringer" (2.74 million viewers, #9; adults 18-49: 1.2, #8). The former was off from last year's "One Tree Hill" season premiere (2.18 million viewers; adults 18-49: 1.1) while "Ringer" improved on "Life Unexpected" second season debut (1.74 million viewers; adults 18-49: 0.8). Overall, "Ringer" posted the largest audience in the network's Tuesday, 9:00/8:00c time period in over two years and the highest 18-49 rating since the debut of "Melrose Place" (1.3 on 9/8/09).

In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.9/8; CBS's "Late Show with David Letterman," 2.3/6 with an encore; and ABC's combo of "Nightline," 3.4/8; and "Jimmy Kimmel Live," 1.6/5.

In the 25 markets with Local People Meters, adult 18-49 results were: "The Tonight Show with Jay Leno," 0.9/4; "Late Show," 0.6/3 with an encore; "Nightline," 1.0/5; and "Jimmy Kimmel Live," 0.6/4.

At 12:35 a.m., "Late Night with Jimmy Fallon" (1.4/5 in metered-market households) beat CBS's "Late Late Show with Craig Ferguson" (1.2/4). In the 25 markets with Local People Meters, "Late Night" (0.6/4 in 18-49) topped "Late Late Show" (0.3/2).

At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.8/4 in metered-market households with an encore and a 0.4/3 in adults 18-49 in the 25 markets with local people meters.